Kropyvnytskyi steel pipe round, square 10-120mm, metal (black) seamless pipes, seamless cutting and delivery
Steel round pipes are used for the construction of heating mains, oil pipelines, water pipelines and gas pipelines. Indispensable as supports in the construction of metal structures. Depending on the type of pipe, method of manufacture and technical characteristics, its purpose is determined. Types of steel round pipes There are several types of steel round pipes, they differ not only in appearance, but also in purpose and production method. Seamless. Very strong, the absence of a seam eliminates the leakage of the working medium. Seamless pipes are used in various fields - from mechanical engineering to the creation of water and gas pipelines. Produced by hot or cold rolling technologies. Straight seam electrowelded. They are easy to identify by one seam running along the entire length. They are universal, pipelines are mounted from them, they are used in construction and industrial enterprises. Spiral electric welded. They have a spiral seam made along a helical line, such welding prevents the appearance of longitudinal cracks. Water and gas pipelines (VGP). Strong and wear-resistant, they are used to create water and gas pipelines, which is logical from their name. They are classified according to nominal diameter - the inner diameter, rounded to the nearest standard value. GOSTs regulating production GOST 8734-75/GOST 8733-74 GOST 8732-78/GOST 8731-74 GOST 10704-91 / GOST 10705-80 Production of round pipes There are two production methods - hot and cold rolling. Each technology allows you to get products with certain properties. Hot rolling. The workpiece is heated to a certain temperature, then a hole is formed to obtain a hollow cylinder. The hot sleeve is rolled out to obtain a given profile. At the end of the process, the rolled product is cut. Hot-formed round pipes in accordance with GOST 8732-78 are less hard, more amenable to processing, and are not produced with small diameters and thin walls. Cold rolling. The process is different in that after forming the sleeve is cooled and processed already in a cold state. At the end, the product must be annealed and cooled. Finished rolled products have high dimensional accuracy, cleanliness of internal and external walls. The material is strengthened during processing, it is possible to produce thin-walled metal round pipes of small diameters. Production is regulated by GOST 8734-75. For the manufacture of a round electric-welded pipe in accordance with GOST 10704-91, cold-woven or hot-woven sheet metal - the strip is cut into strips. A steel strip is welded from these strips. A blank with a round section is formed from the tape. Next, the seam is boiled, and the workpiece is calibrated in the rollers. The finished product is cut into pieces. Marking Marking is regulated by GOST No. 10692-80. For some, this is just an incomprehensible set of letters and numbers, but for a true specialist, it is comprehensive information. It is applied to each product with a wall thickness of more than 3.5 mm and a diameter of 159 mm. With a smaller section, the label of the package is marked. The designation indicates the steel grade, name, dimensions and trademark of the manufacturer. Marking is applied with indelible paint, branding, electrograph or electric pencil. Application The main area of application is the construction of pipelines for water, gas, oil products. Depending on the medium to be transferred, the surface can be galvanized, covered with anti-corrosion paint, polymer coating or insulation. Such metal products are indispensable in mechanical engineering, construction in the construction of supports and in the furniture industry.
12/13/2020 32 views no comments Article rating 1 star2 stars3 stars4 stars5 stars What are round steel pipes — Round steel pipe: types and applications Steel round pipes are used for the construction of heating mains, oil pipelines, water pipelines and gas pipelines. Indispensable as supports in the construction of metal structures. Depending on the type of pipe, method of manufacture and technical characteristics, its purpose is determined. Types of steel round pipes There are several types of steel round pipes, they differ not only in appearance, but also in purpose and production method. Seamless. Very strong, the absence of a seam eliminates the leakage of the working medium. Seamless pipes are used in various fields - from mechanical engineering to the creation of water and gas pipelines. Produced by hot or cold rolling technologies. Straight seam electrowelded. They are easy to identify by one seam running along the entire length. They are universal, pipelines are mounted from them, they are used in construction and industrial enterprises. Spiral electric welded. They have a spiral seam made along a helical line, such welding prevents the appearance of longitudinal cracks. Water and gas pipelines (VGP). Strong and wear-resistant, they are used to create water and gas pipelines, which is logical from their name. Classified by conditional pass -inside diameter, rounded to the nearest standard value. GOSTs regulating production GOST 8734-75/GOST 8733-74 GOST 8732-78/GOST 8731-74 GOST 10704-91 / GOST 10705-80 Production of round pipes There are two production methods - hot and cold rolling. Each technology allows you to get products with certain properties. Hot rolling. The workpiece is heated to a certain temperature, then a hole is formed to obtain a hollow cylinder. The hot sleeve is rolled out to obtain a given profile. At the end of the process, the rolled product is cut. Hot-formed round pipes in accordance with GOST 8732-78 are less hard, more amenable to processing, and are not produced with small diameters and thin walls. Cold rolling. The process is different in that after forming the sleeve is cooled and processed already in a cold state. At the end, the product must be annealed and cooled. Finished rolled products have high dimensional accuracy, cleanliness of internal and external walls. The material is strengthened during processing, it is possible to produce thin-walled metal round pipes of small diameters. Production is regulated by GOST 8734-75. For the manufacture of a round electric-welded pipe in accordance with GOST 10704-91, cold-woven or hot-woven sheet metal - the strip is cut into strips. A steel strip is welded from these strips. A blank with a round section is formed from the tape. Next, the seam is boiled, and the workpiece is calibrated in the rollers. The finished product is cut into pieces. Marking Marking is regulated by GOST No. 10692-80. For some, this is just an incomprehensible set of letters and numbers, but for a true specialist, it is comprehensive information. It is applied to each product with a wall thickness of more than 3.5 mm and a diameter of 159 mm. With a smaller section, the label of the package is marked. The designation indicates the steel grade, name, dimensions and trademark of the manufacturer. Marking is applied with indelible paint, branding, electrograph or electric pencil. Application The main area of application is the construction of pipelines for water, gas, oil products. Depending on the medium to be transferred, the surface can be galvanized, covered with anti-corrosion paint, polymer coating or insulation. Such metal products are indispensable in mechanical engineering, construction in the construction of supports and in the furniture industry. To buy round metal pipes, call +7 (812) 905-83-88 or leave a request on the website, we will call you back. We will select products, calculate weight, cost, answer all questions. We will choose the best solution. The range is presented in the catalogue: STEEL PIPES. Round steel pipe: selection, calculation and application in construction. To understand what a round steel pipe is and how to use it, you need to understand what it is made of and by what rules. These rules are described by GOST. Classification scheme for metal pipes. Round metal pipes are divided into: longitudinal electric welded (EsvPSH), GOST 10705-80, 10704-91, 10706-76; water and gas pipelines (VGP), GOST 3262-75; electrowelded, GOST 10705-91; seamless thick-walled, GOST 8734-75, 8732-78, 8731-78. Electric-welded circular cross-section straight-seam, with a diameter of 10 mm to 530 mm, are made of metal, steel strips by forming and welding a direct joint. These tubular products are made from low carbon and carbon steel. Water and gas pipelines (VGP) are round, 4-12 m long, are certified. Such products are made in the factory on pipe mills. The edges of the product are processed for welding, a chamfer is made at about 45 degrees. Repair of heating Heating of a summer residence Heating of a house Water supply of a house Water supply of a summer residence Scheme of section of a seamless pipe. Repair of heating Heating of a summer residence Heating of a house Water supply of a house Water supply of a summer residence Seamless seamless steel, with a diameter of 10 mm to 1500 mm, is limited by the outer diameter. For the production of such products, carbon steel, alloyed, is used. The absence of seams allows the use of seamless steel tubular products under high mechanical loads. According to the manufacturing method, steel tubular products are: seamless, cast and welded. Steel pipes are made with a diameter of 8-1620 mm and a length of 4-12 m. GOST regulates the manufacture of metal products with an outer diameter of 10-1420 mm. If the diameter exceeds 1420 mm, this is negotiated with the customer and manufactured according to technical specifications (TU). Steel round pipes have improved performance: they are strong, durable and reliable. GOST also sets the dimensions and maximum deviations for steel products: 1. Random length: at least 2 m - diameter up to 30 mm; not less than 3 m - 30-70; not less than 4 m - 70-152; not less than 5 m - above 152. 5-9 m in length - diameter up to 70 mm; 6-9 m length - 70-219; 10-12 m length - 219-426. The wall of the steel pipe is 0.8-20 mm thick. Scheme of connection of steel pipes. The strong welded seam guarantees durability and safety to products. The seam is made by an automatic machine during molding. High product quality assuranceley is achieved and checked in various ways: steel round pipes are visually inspected; ultrasonic testing of the weld; hydraulic testing of steel. The weldability of steel is a complex characteristic that takes into account the strength of the product under various conditions, resistance to cracking, and cold brittleness. In the operation of welded structures, an indicator of the quality of the connection is the state of the seams. If the examination of the product does not find cracks in the welds, then further inspection of the product can be omitted. The weldability of steel in operating structures is evaluated by the carbon equivalent: steel is well welded at the diameter of a steel water pipe. To calculate the performance of a water supply system, you need to imagine its scheme: through a water pipe, round and steel, then a water tower, water is supplied by an electric pump to consumers. The pump has a capacity = Q, m3/s. Lt is the length of the conduit, in meters (m), Ho is the height of the geometric rise of water, in meters, V is the flow velocity, in meters per second (m/s) hn is the head loss, (m2/s) Scheme for the production of electric-welded steel pipes . According to the law of hydraulics: with an increase in V, the diameter of the water pipe decreases, the amount of metal decreases - this reduces its cost. But with an increase in V, the water pressure loss in the conduit increases - hn. With an increase in head loss, it is necessary to add water supply by a pump, the water flow increases. From this it can be seen that the pump needs more performance, power and an increased amount of energy (will lead to an increase in the cost of the circuit): Q = (Ho + hn) 1.02, m3 / s 1.02 - from the table of correction factors. From a simple calculation, the mathematical and economic dependence between the flow rate of water in the pipeline, its diameter and the amount of pumped water is clearly visible. 1. Pipeline diameter, calculation: 1.13 - special coefficient of transition from the liquid flow section to the pipeline diameter; Wi is the calculated water flow, m3/h; V is the economically beneficial water velocity used in the calculations, from 0.9 m/s to 1.9 m/s; ! In calculations, the diameter values actually obtained are rounded up to the maximum standard values. 2. The actual speed of water in the pipeline: Scheme for calculating water pipes. Vf = Wi / w , (m3/h), where Vf is the actual flow rate, m3/h; Wi is the calculated water flow, m3/h; W is the cross-sectional area of the pipeline used, m2. 3. Pipeline cross-sectional area: w = (?? Df2)/4, (m2), where Df is the accepted pipe diameter, m; 4. Calculation of head loss: hn = A ? Lt. Wi2, where A is the specific resistance of the pipes, look at the table, s / m3;
Today, round pipes, due to their high sustainable and practical qualities, are in great demand in various areas of construction and industrial enterprises, as well as in housing and communal areas. As we know, steel is a very durable material at an affordable price. That is why round pipes have gained immense popularity in various fields, without which humanity cannot do without. Steel pipes are diverse: round pipes, shaped pipes, electric-welded and seamless, water and gas pipes. Gas and water supply, heating systems cannot do without electric-welded pipes. To get such pipes, special ones are taken. rolling strips and sheets of metal. They are stretched, and then rolled up with the help of a welding and forming mill. At the end, the pipe seam is welded and the pipe is processed in special. atmosphere (protective) - the latter so that scale does not form on the surface of the pipe. And round pipes without a seam are produced by hot rolling using solid metal blanks. These blanks are subjected to heat from the beginning of the process, and then they are stitched. The completion of the production process is the rolling of blanks on special. become. The seamless round pipe is widely used in laying oil pipelines, gas pipelines, in high-pressure heating networks, as well as in all kinds of drilling work. In addition, this type of round pipes is used in the construction of machines. You need to know that Voronezh round pipes made of steel can have a protective coating. Often, a coating of a small layer of zinc is made on the surface of such pipes. It is because of the galvanization that the pipes receive good anti-corrosion qualities, which increases their service life up to 35 years (for comparison: a simple steel pipe will last no more than 15 years). Galvanized round pipes can be made from carbon steel or low carbon steel. The welded seam of a round pipe can be made both spirally and parallel to the axis of the entire pipe. In addition to galvanizing pipes, their anti-corrosion protection, such as polymer insulation, is widely used today. substances. Round steel pipes with polyurethane foam insulation are an excellent tool for cold and hot water supply, in the thermal insulation of heating networks, in pipelines in which cold products are transported. Steel pipes with insulation extend their service life up to 40 years due to it. They also have reduced laying costs, application and repair costs, andimportant - the loss of structural heat is greatly reduced. For different specializations of pipelines, there will always be suitable Voronezh steel round pipes: with a thread for coupling fastenings, with a smooth end for welding installation, electric-welded and seamless, galvanized and non-galvanized steel pipe. Steel round pipes, due to their purpose, have a difference in diameter. For example, pipes with a diameter of 40 mm, 50 mm, 57 mm are used in heating systems, and round pipes with a diameter of 20 mm, 25 mm, 32 mm are required in water supply systems. Steel pipes also have a division according to the classification: The first class includes simple iron pipes. They are used in fences, supports, with local supply of gas and liquid substances. The second includes those pipes that operate in gas, water, oil pipelines. Available for both high and low pressure. The third is steel pipes that can withstand constant high temperature and pressure. Such pipes are applicable in the fields of chemical, nuclear, food and oil. The fourth includes round steel pipes, which are needed in drilling, casing and just additional pipes. The fifth class is a pipe for furniture production, mechanical engineering and construction. The last, sixth - pipes only for use in the construction of machines. They produce shafts, pistons and more.
Overview of applications depending on the production technology:
Seamless. Pumping of oil products or similar compositions under high pressure.
Welded. Creation of heat and water supply lines, manufacturing of parts of metal structures.
Water and gas pipelines. Distribution engineering networks for hot and cold water transportation, gas supply.
Special requirements are imposed on pipes from which parts with extreme operating conditions will be made. It can be motor pistons, cylinders. The blanks need to be further processed.
Advantages and disadvantages
The main advantage of steel round pipes is mechanical strength. Therefore, they are used in high pressure lines. Even with short-term critical indicators, the walls of the products are not deformed. To maintain reliability, special couplings are installed at the joints of the nozzles.
Description of benefits
Additional benefits:
minimum coefficient of thermal expansion;
the material is airtight, there is no mixing of the working medium in the system;
the ability to choose in size, wall thickness, manufacturing method;
relatively low cost.
The main disadvantage is susceptibility to rust. But to solve it, additional processing technologies are used, external protective layers are provided. During the design, the large mass of steel pipes is taken into account. To create highways, additional attachment points and supports are needed.
Scope of pipes with a square section
Our life is simply impossible without the use of metal structures. Professional pipes in comparison with other types of profiles (round, corners, channels, I-beams) have much greater strength and resistance to crushing and twisting with the same weight per linear meter of the profile. Therefore, they are widely used in all types of structures.
Scope of square profile pipes:
At all enterprises of industry, agriculture, mining complex, energy enterprises. Metal structures are used for the installation of machine tools and mills, roller tables, conveyors, carts, cranes, crane beams, supports of the gas transmission system and power lines, transitional bridges and fences in workshops and in the open.
In all types of construction. Metal structures are used in all apartment buildings, industrial buildings, in the construction of bridges, airports, office buildings, shopping and entertainment facilities, modern stadiums. There are unique buildings in which the length of the span reaches more than a hundred meters.
In railway, road transport, aircraft and shipbuilding.
In oil and gas production complexes, systems for transporting gas and oil products.
In the field of construction of private houses - all kinds of ceilings, fences, sheds, gazebos, garages, gratings, gates and wickets.
In the improvement of cities - small architectural forms (stops, sheds, pavilions, trays), playgrounds, fences, even decorative metal sculptures.
In recent decades, square hollow profile furniture has become very widespread - in offices, schools, cafes and restaurants, public institutions, houses and apartments.
Profile production features
Square-section professional pipes are made by deforming a round billet of the corresponding section.
Pipes for the production of profile products can be electric-welded, hot-rolled and cold-rolled. The strongest and most reliable designs are obtained from hot or cold rolled products. They are usually used for the manufacture of trusses and arches of large industrial andpublic buildings, bridges, unique structures. But for use in private housing construction, for all kinds of arbors, sheds, fences, furniture, electric-welded pipes are more often used. It is impossible to make such products in a handicraft way.
Production method using electric welding
Most often, electric-welded blanks are used for the production of profiled pipes. The manufacturing technology of such profiles from steel strips includes the following steps:
Trimming tapes in width to size.
Bending tapes.
Welding.
Removal of influxes (burr) on the seam.
The resulting round billet is molded on special rollers.
The resulting square blank is cut to size.
The product is subjected to heat treatment - annealing or normalization (heating to a certain temperature, exposure, cooling with an oven or in air).
Advantages and disadvantages
The main advantage of a square pipe is high strength characteristics: maximum strength and resistance to twisting and crushing compared to round and rectangular pipes and other types of profile. In addition, it is easier and cheaper to manufacture than other types of corrugated pipes.
The use of a professional pipe in the manufacture of various structures allows you to quickly and quickly manufacture and assemble buildings, fences, gratings and eliminates expensive stone work.
Square products are easier to store and transport, they take up less space than round ones - this reduces the cost of transportation. When laying communications in a metal casing, it is also convenient to use square products.
The most serious disadvantage of steel structures is poor resistance to corrosion. To do this, the professional pipe is coated with zinc and painted. The paint will need to be refreshed periodically.
Sometimes the disadvantage of steel structures is the need for installation by welding. Despite some complexity of this process of assembling structures, it is welding that provides maximum strength and reliability of joints.
Standards, parameters and assortment of pipes
The release of a professional pipe in the Russian Federation is regulated by GOST 8639-82. For the manufacture of a square pipe, carbon and low-alloy steel grades are usually used, most often St3sp or 09G2S; sometimes stainless steel products are also produced.
Profile range
The range of profiled square pipes produced includes products with section sizes from 10×10 mm to 400×400 mm. The wall thickness varies from 1 to 22 mm. A professional pipe is usually produced in lengths of 6 or 12 m, sometimes 18 m, occasionally random lengths.
